Surface Mount Fixed Resistors

Resistors are referred to as a Passive Component. Surface Mount Resistors are more commonly known as SMD (surface mount device) or SMT (Surface mount technology) Resistors. These resistors offer advantages in space saving on Printed Circuit Boards (PCB’s).


Some common package sizes are 0201,0402,0603,0805,1206,1210,2020,2512


SMD Resistors are used in large volumes and are the preferred choice in electronics equipment due to their small size and high reliability. SMD resistors are particularly used in telecommunication, automotive (AEC Q200 qualified) and medical equipment, they also found in personal devices, displays and advanced technology research instruments.


SMD Fixed Resistors


Surface mount fixed resistors are the most widely used resistors as they reduce the flow of the electrical current in circuits. Similar to water flowing along a pipe, the tap controls the flow of water, a resistor controls the flow of current. They work to a fixed value the resistance does not change in temperature or voltage. The most commonly used fixed resistors values are 100KΩ,10kΩ,100Ω, 10Ω


Types of surface mount fixed resistors


  • Thin Film Resistors have a higher precision than the thick film

  • Thick Film Resistors are used for general use due to a lower price point.

  • Moulded Wirewound Resistors offer higher power

  • Foil Resistors for ultra-high precision and really low-Temperature coefficient of resistance

  • Shunts (current sense) Low ohmic values for where current measurement is critical

  • Melf (cylindrical) offering superb pulse load capability

What are surface mount fixed resistors used for?


SMD fixed resistors are very compact and used in most electronic board design. Due to their compact size and the continuous development of ever smaller footprints, this has allowed for the development of ever smaller PCB designs and the ability to get more from the board. The resistors can assist in the reduction of component count on the board.


High Power / Surge / pulse protection


Many manufacturers offer a higher power alternative for the various packages they have available. As an example the 0603 resistor package can vary from 0.1W to 0.25W (rated dissipation 70°C). The higher power alternatives can be used in applications where there is a need to protect against surges / pulses.


What is the difference between Thin Film Resistors and Thick Film Resistors?


The main difference being that the thick film resistors have a paste fired on to the manufacturers chosen substrate. Thin film resistors as the name suggests has an extremely thin metal film that is generally vacuum deposited on to the manufacturers chosen substrate.


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Description Price Resistance Package/Case Technology Tolerance Power Rating Temperature Coefficient Automotive Standard Dimensions Length Depth Height Series Minimum Operating Temperature Maximum Operating Temperature
RS Stock No. 134-5439
Mfr. Part No.CRG0603F1K2
$0.007
Each (On a Reel of 5000)
units
1.2 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 213-2272
Mfr. Part No.CRG0603F1K2
$0.026
Each (In a Pack of 50)
units
1.2 kΩ 0603 (1608M) Thick Film ±1% 0.1W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 223-0427
Mfr. Part No.CRG0805F1K0
$0.086
Each (In a Pack of 50)
units
1 kΩ 0805 Thick Film ±1% 0.125W ±100ppm/°C - 2 x 0.5mm 2mm 1.25mm 0.5mm CRG -55°C +125°C
RS Stock No. 134-5474
Mfr. Part No.CRG0805F1K0
$0.006
Each (On a Reel of 5000)
units
1 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 125-1192
Mfr. Part No.CRG1206F10K
$0.047
Each (In a Bag of 100)
units
10 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 134-5524
Mfr. Part No.CRG1206F10K
$0.016
Each (On a Reel of 5000)
units
10 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 134-5485
Mfr. Part No.CRG0805F10K
$0.007
Each (On a Reel of 5000)
units
10 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 125-1189
Mfr. Part No.CRG0805F10K
$0.047
Each (In a Bag of 100)
units
10 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRG -55°C +125°C
RS Stock No. 679-0825
Mfr. Part No.CRCW080510R0FKEA
BrandVishay
$0.045
Each (In a Pack of 50)
units
10 Ω 0805 Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 169-4501
Mfr. Part No.CRCW080510R0FKEA
BrandVishay
$0.012
Each (On a Reel of 5000)
units
10 Ω 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 679-2326
Mfr. Part No.CRCW120675K0FKEA
BrandVishay
$0.141
Each (In a Pack of 50)
units
75 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 169-4968
Mfr. Part No.CRCW120675K0FKEA
BrandVishay
$0.016
Each (On a Reel of 5000)
units
75 kΩ 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 169-4584
Mfr. Part No.CRCW080522K0FKEA
BrandVishay
$0.012
Each (On a Reel of 5000)
units
22 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 679-1109
Mfr. Part No.CRCW080522K0FKEA
BrandVishay
$0.104
Each (In a Pack of 50)
units
22 kΩ 0805 (2012M) Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 391-5630
Mfr. Part No.RR1220P-103-D
BrandSusumu Co
$0.059
Each (In a Pack of 100)
units
10 kΩ 0805 (2012M) Thin Film ±0.5% 0.1W ±25ppm/°C - - - - - RR -55°C +125°C
RS Stock No. 167-4483
Mfr. Part No.CRA2512-FZ-R025ELF
BrandBourns
$0.552
Each (On a Reel of 4000)
units
25 mΩ 2512 (6432M) Metal Alloy ±1% 3W ±75ppm/°C AEC-Q200 - - - - CRA -55°C +170°C
RS Stock No. 182-5449
Mfr. Part No.CRCW080582R0FKEA
BrandVishay
$0.03
Each (On a Reel of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 679-0807
Mfr. Part No.CRCW0805100RFKEA
BrandVishay
$0.052
Each (In a Pack of 50)
units
100 Ω 0805 Thick Film ±1% 0.125W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 679-2263
Mfr. Part No.CRCW1206620RFKEA
BrandVishay
$0.14
Each (In a Pack of 50)
units
620 Ω 1206 (3216M) Thick Film ±1% 0.25W ±100ppm/°C - - - - - CRCW -55°C +155°C
RS Stock No. 520-7470
Mfr. Part No.ERJS08J621V
BrandPanasonic
$0.161
Each (In a Pack of 50)
units
620 Ω 1206 (3216M) Thick Film ±5% 0.25W ±200ppm/°C AEC-Q200 - - - - ERJ -55°C +155°C
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